/*******************************************************************************
* Copyright 2002-2020 Intel Corporation
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
*     http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*******************************************************************************/

/* 
// 
//  Purpose:
//     Cryptography Primitive.
//     Internal Definitions and
//     Internal DES based Encrypt/Decrypt Function Prototypes
// 
// 
*/


#if !defined(_PCP_DES_H)
#define _PCP_DES_H


/*
// really DES round key saved in terms of pear of 24-bit half mentioned in FIPS 46-3
*/
typedef Ipp64u RoundKeyDES;
typedef Ipp32u HalfRoundKeyDES;

/*
// DES context
*/
struct _cpDES {
   IppCtxId     idCtx;        /* DES spec identifier           */
   Ipp32u       dummy;        /* alignment only (linux problem)*/
   RoundKeyDES  enc_keys[16]; /* array of keys for encryprion  */
   RoundKeyDES  dec_keys[16]; /* array of keys for decryprion  */
};

/* alignment */
#define DES_ALIGNMENT ((int)(sizeof(Ipp64u)))

#define MBS_DES   (8)      /* data block (bytes) */

/*
// Useful macros
*/
#define DES_ID(ctx)        ((ctx)->idCtx)
#define DES_EKEYS(ctx)     ((ctx)->enc_keys)
#define DES_DKEYS(ctx)     ((ctx)->dec_keys)
#define DES_ID_TEST(ctx)   (DES_ID((ctx))==idCtxDES)

/*
// Internal Tables
*/
#define MITIGATED    (4)

#define IMPLEMENTATION MITIGATED


#if (IMPLEMENTATION == MITIGATED)
   extern const __ALIGN64 Ipp32u DESspbox[16*16];
#endif


/*
// internal functions
*/
#define SetKey_DES OWNAPI(SetKey_DES)
   void SetKey_DES(const Ipp8u* pKey, IppsDESSpec* pCtx);

#define Cipher_DES OWNAPI(Cipher_DES)
 Ipp64u Cipher_DES(Ipp64u inpBlk, const RoundKeyDES* pRKey, const Ipp32u spbox[]);

#define ENCRYPT_DES(blk, pCtx)   Cipher_DES((blk), DES_EKEYS((pCtx)), DESspbox)
#define DECRYPT_DES(blk, pCtx)   Cipher_DES((blk), DES_DKEYS((pCtx)), DESspbox)

/* TDES prototypes */
#define ECB_TDES OWNAPI(ECB_TDES)
   void ECB_TDES(const Ipp64u* pSrc, Ipp64u* pDst, int nBlocks, const RoundKeyDES* pRKey[3], const Ipp32u spbox[]);
#define EncryptCBC_TDES OWNAPI(EncryptCBC_TDES)
   void EncryptCBC_TDES(const Ipp64u* pSrc, Ipp64u* pDst, int nBlocks, const RoundKeyDES* pRKey[3], Ipp64u iv, const Ipp32u spbox[]);
#define DecryptCBC_TDES OWNAPI(DecryptCBC_TDES)
   void DecryptCBC_TDES(const Ipp64u* pSrc, Ipp64u* pDst, int nBlocks, const RoundKeyDES* pRKey[3], Ipp64u iv, const Ipp32u spbox[]);

#endif /* _PCP_DES_H */
